/* roulang page: index */
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  background:
    radial-gradient(ellipse at 15% 10%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 85%, rgba(99, 60, 190, 0.10) 0%, transparent 55%),
    #0B1B3F;
  min-height: 100vh;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul, ol { list-style: none; }

:root {
  --bg-primary: #0B1B3F;
  --bg-deep: #041025;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-hover: rgba(255, 255, 255, 0.10);
  --border-card: rgba(255, 255, 255, 0.12);
  --border-card-hover: rgba(0, 212, 255, 0.35);
  --accent: #00D4FF;
  --accent-dark: #00A8CC;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --accent-glow-strong: rgba(0, 212, 255, 0.5);
  --text-primary: #E6EDF9;
  --text-secondary: #A7B6D0;
  --text-muted: #6B7C99;
  --success: #4ADE80;
  --warning: #FFB84D;
  --danger: #F87171;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 0 1px rgba(0, 212, 255, 0.2), 0 0 20px rgba(0, 212, 255, 0.15);
  --space-section: clamp(3rem, 6vw, 6rem);
  --container-width: 1200px;
  --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Container ===== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
}

/* ===== Utilities ===== */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}
.glass-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-card-hover);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.2), 0 0 30px rgba(0, 212, 255, 0.15), 0 12px 32px rgba(0, 0, 0, 0.3);
  background: var(--bg-card-hover);
}

.section {
  padding: var(--space-section) 0;
}
.section-header {
  text-align: center;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}
.section-header .section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  background: rgba(0, 212, 255, 0.08);
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
  border: 1px solid rgba(0, 212, 255, 0.18);
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
}
.section-header p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 8px auto 0;
  font-size: 1rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  text-align: center;
  min-height: 44px;
}
.btn i { font-size: 1rem; }
.btn-primary {
  background: linear-gradient(135deg, #00D4FF 0%, #00A8CC 100%);
  color: #041025;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 28px rgba(0, 212, 255, 0.45);
  transform: translateY(-2px);
}
.btn-primary:active { transform: translateY(0); box-shadow: 0 2px 12px rgba(0, 212, 255, 0.3); }
.btn-primary:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--accent);
  transform: translateY(-2px);
}
.btn-secondary:active { transform: translateY(0); }
.btn-secondary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.btn-lg { padding: 15px 36px; font-size: 1.05rem; }

/* ===== Badges & Tags ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.badge-green {
  background: rgba(74, 222, 128, 0.12);
  color: var(--success);
  border: 1px solid rgba(74, 222, 128, 0.25);
}
.badge-orange {
  background: rgba(255, 184, 77, 0.12);
  color: var(--warning);
  border: 1px solid rgba(255, 184, 77, 0.25);
}
.badge-blue {
  background: rgba(0, 212, 255, 0.10);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.22);
}
.tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(0, 212, 255, 0.10);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.15);
}

/* ===== Header / Navigation ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(4, 16, 37, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background var(--transition-base);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo .logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, #00D4FF, #0080FF);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: #041025;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
}
.nav-logo .logo-text {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.nav-logo .logo-text span {
  background: linear-gradient(90deg, #00D4FF, #7EE8FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  position: relative;
}
.nav-item i { font-size: 0.8rem; }
.nav-item:hover {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
}
.nav-item.active {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.12);
  font-weight: 600;
}
.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}
.nav-cta {
  margin-left: 8px;
}
.nav-cta .btn {
  padding: 8px 20px;
  font-size: 0.85rem;
  min-height: 38px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 140px 0 80px;
  background:
    linear-gradient(135deg, rgba(4, 16, 37, 0.92) 0%, rgba(11, 27, 63, 0.75) 50%, rgba(4, 16, 37, 0.85) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}
.hero-content { max-width: 640px; }
.hero-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: 0.01em;
}
.hero-title .gradient-text {
  background: linear-gradient(90deg, #00D4FF, #7EE8FF, #00D4FF);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shine 3s linear infinite;
}
@keyframes shine {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 540px;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.hero-meta i { color: var(--accent); }
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.hero-visual::before {
  content: '';
  position: absolute;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(20px);
}
.phone-frame {
  position: relative;
  width: 280px;
  height: 580px;
  background: rgba(4, 16, 37, 0.6);
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-radius: 44px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), inset 0 0 0 2px rgba(255, 255, 255, 0.04);
  overflow: hidden;
  backdrop-filter: blur(10px);
}
.phone-frame::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 22px;
  background: rgba(4, 16, 37, 0.9);
  border-radius: 20px;
  z-index: 10;
}
.phone-screen {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding-top: 40px;
}
.phone-screen img {
  width: 100%;
  height: 55%;
  object-fit: cover;
}
.phone-screen-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(180deg, rgba(4, 16, 37, 0) 0%, rgba(4, 16, 37, 0.8) 30%);
}
.phone-screen-content h4 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.phone-screen-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Trust Bar ===== */
.trust-bar {
  background: rgba(4, 16, 37, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 36px 0;
}
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: background var(--transition-base);
}
.trust-item:hover { background: rgba(255, 255, 255, 0.06); }
.trust-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent);
  flex-shrink: 0;
}
.trust-text h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}
.trust-text p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  padding: 36px 30px;
  text-align: left;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.feature-card:hover::before { opacity: 0.6; }
.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.16), rgba(0, 128, 255, 0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 20px;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Showcase / Guide ===== */
.showcase {
  background: linear-gradient(180deg, rgba(4, 16, 37, 0.4) 0%, transparent 50%);
}
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.showcase-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}
.showcase-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 300px;
}
.showcase-media .media-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(4, 16, 37, 0.8);
  backdrop-filter: blur(12px);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
}
.showcase-content h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}
.showcase-content > p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
  line-height: 1.8;
}
.steps-list { display: flex; flex-direction: column; gap: 20px; }
.step-item {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: all var(--transition-base);
}
.step-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.2);
}
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #0080FF);
  color: #041025;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.3);
}
.step-text h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.step-text p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Requirements ===== */
.req-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.req-card {
  padding: 28px 22px;
  text-align: center;
}
.req-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.3rem;
  color: var(--accent);
}
.req-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.req-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Testimonials ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.testimonial-card {
  padding: 28px 24px;
}
.testimonial-stars {
  display: flex;
  gap: 4px;
  color: var(--warning);
  font-size: 0.85rem;
  margin-bottom: 14px;
}
.testimonial-card blockquote {
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 20px;
  border-left: 3px solid rgba(0, 212, 255, 0.4);
  padding-left: 16px;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #0080FF);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #041025;
  flex-shrink: 0;
}
.testimonial-author .author-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}
.testimonial-author .author-info {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== News Section ===== */
.news-section {
  background: rgba(4, 16, 37, 0.3);
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.news-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.news-thumb {
  position: relative;
  height: 180px;
  overflow: hidden;
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.news-card:hover .news-thumb img { transform: scale(1.05); }
.news-category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(4, 16, 37, 0.8);
  backdrop-filter: blur(8px);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.2);
}
.news-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.news-body h3 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
}
.news-body h3 a {
  color: var(--text-primary);
  transition: color var(--transition-base);
}
.news-body h3 a:hover { color: var(--accent); }
.news-body p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
}
.news-meta time { display: inline-flex; align-items: center; gap: 4px; }
.news-meta .read-more {
  color: var(--accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.news-meta .read-more:hover { text-decoration: underline; }
.empty-tip {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 1rem;
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.02);
}

/* ===== Download CTA ===== */
.download-cta {
  position: relative;
  background:
    linear-gradient(135deg, rgba(4, 16, 37, 0.9), rgba(11, 27, 63, 0.8)),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  padding: var(--space-section) 0;
}
.download-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 60%);
  pointer-events: none;
}
.download-cta .container {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}
.download-cta h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.download-cta p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 36px;
}
.cta-buttons .btn {
  min-width: 180px;
  border-radius: var(--radius-md);
}
.cta-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}
.qr-wrap {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  backdrop-filter: blur(8px);
}
.qr-placeholder {
  width: 90px;
  height: 90px;
  border-radius: 12px;
  border: 1px dashed rgba(255, 255, 255, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-muted);
  font-size: 0.7rem;
  background: rgba(255, 255, 255, 0.04);
}
.qr-wrap p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-align: left;
  margin: 0;
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color var(--transition-base), background var(--transition-base);
}
.faq-item.active {
  border-color: rgba(0, 212, 255, 0.35);
  background: rgba(255, 255, 255, 0.06);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: color var(--transition-base);
}
.faq-question:hover { color: var(--accent); }
.faq-question .faq-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent);
  font-size: 0.75rem;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}
.faq-item.active .faq-icon { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== Footer ===== */
.site-footer {
  background: #041025;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 60px 0 90px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .footer-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-brand .footer-logo .logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, #00D4FF, #0080FF);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #041025;
}
.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}
.footer-col ul a:hover {
  color: var(--accent);
}
.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-copyright a { color: var(--text-muted); }
.footer-copyright a:hover { color: var(--accent); }

/* ===== Mobile Tabbar ===== */
.mobile-tabbar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  background: rgba(4, 16, 37, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: env(safe-area-inset-bottom);
}
.mobile-tabbar .tabbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 60px;
}
.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 12px;
  transition: all var(--transition-base);
  min-height: 44px;
}
.tab-item i {
  font-size: 1.1rem;
}
.tab-item.active {
  color: var(--accent);
}
.tab-item.active i {
  text-shadow: 0 0 10px var(--accent-glow);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero { padding: 120px 0 60px; }
  .hero .container { gap: 40px; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .requirements-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid { gap: 40px; }
}

@media (max-width: 768px) {
  body { padding-bottom: 60px; }
  .site-header { display: none; }
  .mobile-tabbar { display: block; }
  .hero { padding: 80px 0 60px; min-height: auto; }
  .hero .container { grid-template-columns: 1fr; gap: 40px; padding-top: 30px; }
  .hero-content { max-width: 100%; text-align: center; }
  .hero-badge-row { justify-content: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-meta { justify-content: center; }
  .hero-visual { order: -1; }
  .phone-frame { width: 220px; height: 440px; border-radius: 32px; }
  .phone-screen { padding-top: 30px; }
  .phone-screen img { height: 50%; }
  .trust-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .features-grid { grid-template-columns: 1fr; gap: 18px; }
  .showcase-grid { grid-template-columns: 1fr; }
  .showcase-content { text-align: center; }
  .steps-list { text-align: left; }
  .requirements-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .testimonials-grid { grid-template-columns: 1fr; gap: 18px; }
  .news-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-copyright { flex-direction: column; text-align: center; }
  .section-header h2 { font-size: 1.5rem; }
  .cta-buttons .btn { min-width: 140px; }
}

@media (max-width: 520px) {
  .hero-title { font-size: 1.8rem; }
  .hero-subtitle { font-size: 0.95rem; }
  .trust-grid { grid-template-columns: 1fr; }
  .requirements-grid { grid-template-columns: 1fr 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .features-grid { gap: 14px; }
  .btn { width: 100%; max-width: 100%; }
  .hero-cta .btn { width: 100%; }
  .cta-buttons { flex-direction: column; align-items: stretch; }
  .cta-buttons .btn { width: 100%; }
  .qr-wrap { flex-direction: column; text-align: center; width: 100%; max-width: 260px; }
  .qr-wrap p { text-align: center; }
  .faq-question { font-size: 0.9rem; padding: 16px 18px; }
  .faq-answer-inner { padding: 0 18px 18px; }
}

/* ===== Focus Visibility ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #041025; }
::-webkit-scrollbar-thumb {
  background: rgba(0, 212, 255, 0.3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(0, 212, 255, 0.5); }

/* roulang page: category1 */
:root {
  --primary: #0B1B3F;
  --primary-deep: #041025;
  --accent: #00D4FF;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --amber: #FFB84D;
  --green: #4ADE80;
  --text: #E6EDF9;
  --text-secondary: #A7B6D0;
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 0 1px rgba(0, 212, 255, 0.2), 0 0 20px rgba(0, 212, 255, 0.15);
  --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --container: 1200px;
  --space: clamp(3rem, 6vw, 6rem);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
  background: var(--primary);
  background-image:
    radial-gradient(ellipse 60% 40% at 15% 10%, rgba(0, 212, 255, 0.08), transparent 60%),
    radial-gradient(ellipse 50% 40% at 90% 20%, rgba(59, 90, 246, 0.07), transparent 65%),
    linear-gradient(180deg, var(--primary) 0%, var(--primary-deep) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .2s ease; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
ul, ol { list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(11, 27, 63, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.logo-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), #2E7CF6);
  border-radius: 10px;
  font-size: 17px;
  font-weight: 900;
  color: #041025;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
}
.logo-text { color: var(--text); }
.logo-text span { color: var(--accent); }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-item i { font-size: 14px; }
.nav-item:hover { color: var(--text); }
.nav-item.active { color: var(--text); border-bottom-color: var(--accent); }
.nav-cta { margin-left: 8px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: all .25s ease;
  min-height: 46px;
  line-height: 1.2;
}
.btn i { font-size: 15px; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #2E7CF6 100%);
  color: #041025;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #33DEFF 0%, #4A8BF8 100%);
  box-shadow: 0 0 32px rgba(0, 212, 255, 0.45);
  transform: translateY(-2px);
}
.btn-primary:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}
.btn-secondary {
  background: var(--glass-bg);
  border-color: var(--glass-border);
  color: var(--text);
  backdrop-filter: blur(10px);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}
.btn-secondary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 14px; min-height: 38px; }

/* ===== Hero ===== */
.category-hero {
  position: relative;
  padding: 160px 0 90px;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  overflow: hidden;
}
.category-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(4, 16, 37, 0.92) 0%, rgba(11, 27, 63, 0.78) 55%, rgba(0, 212, 255, 0.18) 100%);
}
.category-hero::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.5), transparent);
}
.category-hero .container { position: relative; z-index: 2; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 18px;
  border-radius: 999px;
  margin-bottom: 22px;
  letter-spacing: 0.5px;
}
.hero-badge i { font-size: 12px; }
.category-hero h1 {
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.category-hero h1 .accent-text {
  color: var(--accent);
  position: relative;
}
.category-hero p.hero-desc {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 32px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 46px;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.hero-stats .stat-item .stat-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.3;
}
.hero-stats .stat-item .stat-num i { color: var(--accent); font-style: normal; font-size: 20px; }
.hero-stats .stat-item .stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== Section base ===== */
.section { padding: var(--space) 0; position: relative; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}
.section h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 14px;
}
.section-lead {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 660px;
  line-height: 1.8;
  margin-bottom: 40px;
}
.section-head { margin-bottom: 40px; }

/* ===== Quick Check Cards ===== */
.check-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  backdrop-filter: blur(14px);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.glass-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
}
.check-card .card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 22px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.16), rgba(46, 124, 246, 0.16));
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent);
}
.check-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}
.check-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}
.check-card .card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.check-card .card-link:hover { text-decoration: underline; }

/* ===== Steps ===== */
.steps-section {
  background: rgba(4, 16, 37, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step-card {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 30px 24px;
  backdrop-filter: blur(12px);
  transition: transform .3s, box-shadow .3s;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.step-num {
  font-size: 36px;
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 212, 255, 0.5);
  line-height: 1;
  margin-bottom: 14px;
  font-style: italic;
}
.step-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.step-arrow {
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(0, 212, 255, 0.45);
  font-size: 16px;
  z-index: 2;
}

/* ===== Feature split ===== */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.split-media {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  min-height: 360px;
}
.split-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.split-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(4, 16, 37, 0.1), rgba(4, 16, 37, 0.3));
}
.split-content h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; margin-bottom: 16px; line-height: 1.4; }
.split-content p { color: var(--text-secondary); font-size: 15.5px; line-height: 1.85; margin-bottom: 20px; }
.split-list { margin-top: 24px; }
.split-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  color: var(--text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.split-list li:last-child { border-bottom: 0; }
.split-list li i {
  color: var(--green);
  font-size: 14px;
  margin-top: 5px;
}

/* ===== Scenario ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.scenario-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  backdrop-filter: blur(12px);
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.scenario-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
}
.scenario-card .scenario-icon {
  font-size: 28px;
  margin-bottom: 14px;
}
.scenario-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}
.scenario-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== Tips Panel ===== */
.tips-panel {
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 255, 0.15);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(46, 124, 246, 0.06));
  padding: 44px;
  backdrop-filter: blur(14px);
}
.tips-panel h2 { font-size: 26px; font-weight: 800; margin-bottom: 24px; }
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 32px;
}
.tip-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.tip-item .tip-dot {
  width: 30px;
  height: 30px;
  min-width: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.15);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  margin-top: 3px;
}
.tip-item h4 {
  font-size: 15.5px;
  font-weight: 700;
  margin-bottom: 4px;
}
.tip-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  margin-bottom: 14px;
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: border-color .3s;
}
.faq-item.active { border-color: rgba(0, 212, 255, 0.4); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
}
.faq-q i {
  color: var(--accent);
  font-size: 14px;
  transition: transform .3s ease;
}
.faq-item.active .faq-q i { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.8;
}
.faq-item.active .faq-a {
  max-height: 320px;
  padding: 0 24px 22px;
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  overflow: hidden;
  padding: 80px 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(4, 16, 37, 0.85);
}
.cta-box {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}
.cta-box h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  margin-bottom: 16px;
}
.cta-box p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.cta-safe-tip {
  margin-top: 22px;
  font-size: 13px;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.cta-safe-tip i { color: var(--green); }

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-deep);
  padding: 70px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 50px;
  padding-bottom: 50px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 340px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 18px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color .2s, padding-left .2s;
}
.footer-col ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-copyright {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 22px 0 26px;
  font-size: 13px;
  color: var(--text-secondary);
}
.footer-copyright a { color: var(--text-secondary); }
.footer-copyright a:hover { color: var(--accent); }

/* ===== Mobile bottom nav ===== */
.mobile-tabbar {
  display: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .check-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .step-arrow { display: none; }
  .split-section { gap: 36px; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-menu { gap: 16px; }
  .nav-item { font-size: 14px; }
  .nav-item span { display: none; }
}
@media (max-width: 768px) {
  body { padding-bottom: 64px; }
  .site-header { display: none; }
  .category-hero { padding: 110px 0 60px; }
  .category-hero h1 { font-size: 30px; }
  .category-hero p.hero-desc { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 20px; }
  .check-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .split-section { grid-template-columns: 1fr; }
  .split-media { min-height: 240px; order: -1; }
  .scenario-grid { grid-template-columns: 1fr; }
  .tips-panel { padding: 28px 20px; }
  .tips-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-copyright { flex-direction: column; text-align: center; }
  .section { padding: 56px 0; }
  .nav-cta { display: none; }

  .mobile-tabbar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    background: rgba(4, 16, 37, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
    justify-content: space-around;
  }
  .mobile-tabbar a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 10px;
    min-width: 64px;
    font-size: 11px;
    color: var(--text-secondary);
    border-radius: 10px;
    transition: color .2s, background .2s;
  }
  .mobile-tabbar a i { font-size: 19px; }
  .mobile-tabbar a.active {
    color: var(--accent);
    background: rgba(0, 212, 255, 0.1);
  }
  .btn-lg { width: 100%; }
}
@media (max-width: 520px) {
  body { font-size: 15px; }
  .container { padding: 0 16px; }
  .category-hero h1 { font-size: 27px; }
  .hero-stats { flex-direction: column; gap: 14px; }
  .btn { width: 100%; }
  .faq-q { font-size: 15px; padding: 18px 18px; }
  .faq-a { font-size: 14px; }
}

/* roulang page: article */
:root {
  --bg-primary: #0B1B3F;
  --bg-deep: #041025;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-hover: rgba(255, 255, 255, 0.10);
  --border-card: rgba(255, 255, 255, 0.12);
  --accent: #00D4FF;
  --accent-dark: #0097D9;
  --accent-glow: rgba(0, 212, 255, 0.35);
  --amber: #FFB84D;
  --green: #4ADE80;
  --text-primary: #E6EDF9;
  --text-secondary: #A7B6D0;
  --text-muted: #6E7FA0;
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 0 1px rgba(0, 212, 255, 0.2), 0 0 20px rgba(0, 212, 255, 0.15);
  --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --container-width: 1200px;
  --space-section: clamp(3rem, 6vw, 6rem);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(ellipse at 18% 0%, rgba(0, 212, 255, 0.09) 0%, transparent 52%),
    radial-gradient(ellipse at 85% 100%, rgba(88, 76, 220, 0.07) 0%, transparent 50%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 62px;
}
@media (min-width: 769px) { body { padding-bottom: 0; } }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; }

.container { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: var(--radius-btn);
  padding: 12px 24px; font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all .25s ease;
}
.btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color: #fff; box-shadow: 0 0 18px rgba(0, 212, 255, 0.28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 28px rgba(0, 212, 255, 0.45); filter: brightness(1.05); }
.btn-primary:active { transform: translateY(0); }
.btn-glass { background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.14); color: var(--text-primary); }
.btn-glass:hover { transform: translateY(-2px); border-color: rgba(0, 212, 255, 0.55); background: rgba(255, 255, 255, 0.12); box-shadow: 0 0 20px rgba(0, 212, 255, 0.12); }
.btn-glass:active { transform: translateY(0); }
.btn-lg { padding: 16px 32px; font-size: 17px; }

/* ===== 徽章 / 标签 ===== */
.badge {
  display: inline-block; padding: 4px 12px; border-radius: var(--radius-pill);
  font-size: 13px; font-weight: 500;
  background: rgba(0, 212, 255, 0.14); color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.22);
}
.tag {
  display: inline-block; padding: 6px 14px; border-radius: var(--radius-pill);
  font-size: 13px; background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.10); color: var(--text-secondary);
  transition: all .2s ease;
}
.tag:hover { color: var(--accent); border-color: rgba(0, 212, 255, 0.4); background: rgba(0, 212, 255, 0.08); }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 27, 63, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { display: flex; align-items: center; gap: 10px; transition: opacity .2s ease; }
.nav-logo:hover { opacity: 0.9; }
.logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, #00D4FF, #0077ff);
  color: #fff; font-weight: 800; font-size: 15px; letter-spacing: 0.5px;
  text-transform: uppercase; box-shadow: 0 4px 16px rgba(0, 212, 255, 0.32);
}
.logo-text { font-size: 18px; font-weight: 800; color: #fff; line-height: 1.2; }
.logo-text span { display: block; font-size: 12px; font-weight: 400; color: var(--accent); letter-spacing: 2px; }
.nav-menu { display: flex; align-items: center; gap: 28px; }
.nav-item {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  height: 72px; border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.nav-item:hover { color: var(--text-primary); }
.nav-item.active { color: var(--accent); border-bottom-color: var(--accent); }
.nav-cta { margin-left: 12px; }
.nav-cta .btn { padding: 10px 20px; font-size: 14px; }

/* ===== 移动端底部 Tab ===== */
.mobile-tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
  display: flex; 
  background: rgba(7, 18, 43, 0.96);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding-bottom: env(safe-area-inset-bottom);
}
.mobile-tabbar .tab-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; padding: 9px 0 7px; font-size: 12px; color: var(--text-secondary); transition: color .2s ease;
}
.mobile-tabbar .tab-item i { font-size: 19px; line-height: 1; }
.mobile-tabbar .tab-item.active { color: var(--accent); }
.mobile-tabbar .tab-item.active i { text-shadow: 0 0 12px rgba(0, 212, 255, 0.6); }
@media (min-width: 769px) { .mobile-tabbar { display: none; } }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  font-size: 14px; color: var(--text-secondary); margin-bottom: 14px;
}
.breadcrumb a { color: var(--text-secondary); transition: color .2s ease; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: #5a6d8a; }
.breadcrumb .current { color: var(--text-primary); font-weight: 500; max-width: 380px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ===== 文章标题区 ===== */
.article-heading {
  position: relative;
  padding: 44px 0 28px;
  background:
    linear-gradient(to bottom, rgba(11, 27, 63, 0.96), rgba(11, 27, 63, 0.85)),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
}
.article-heading .container { max-width: 880px; position: relative; z-index: 2; }
.article-title { font-size: clamp(28px, 4.2vw, 42px); font-weight: 800; line-height: 1.35; margin-bottom: 16px; color: #fff; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; font-size: 14px; color: var(--text-secondary); }
.article-meta i { color: var(--accent); margin-right: 5px; }
.meta-cat { color: var(--accent); font-weight: 500; }

/* ===== 正文区 ===== */
.article-body { padding: 34px 0 12px; }
.container-narrow { max-width: 880px; }
.article-content {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: clamp(24px, 4vw, 44px);
  box-shadow: var(--shadow-card);
}
.article-content h2 { font-size: 26px; font-weight: 700; margin: 32px 0 14px; color: #fff; padding-bottom: 10px; border-bottom: 1px solid rgba(0, 212, 255, 0.12); }
.article-content h3 { font-size: 20px; font-weight: 600; margin: 26px 0 10px; color: #fff; }
.article-content h4 { font-size: 18px; font-weight: 600; margin: 20px 0 8px; color: #fff; }
.article-content p { margin-bottom: 18px; font-size: 16px; line-height: 1.9; color: #D8E2F2; }
.article-content blockquote { border-left: 4px solid var(--accent); background: rgba(0, 212, 255, 0.06); padding: 16px 20px; margin: 24px 0; border-radius: 0 12px 12px 0; color: var(--text-secondary); }
.article-content code { font-family: Consolas, Monaco, monospace; font-size: 0.92em; background: rgba(255, 255, 255, 0.08); padding: 2px 6px; border-radius: 6px; color: var(--accent); }
.article-content pre { background: var(--bg-deep); padding: 18px 20px; border-radius: 14px; overflow-x: auto; margin: 22px 0; border: 1px solid rgba(255, 255, 255, 0.08); }
.article-content a { color: var(--accent); border-bottom: 1px dashed rgba(0, 212, 255, 0.4); transition: border-color .2s; }
.article-content a:hover { border-bottom-color: var(--accent); }
.article-content img { border-radius: 14px; margin: 22px 0; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3); }
.article-content ul, .article-content ol { margin: 18px 0; padding-left: 22px; }
.article-content ul li { list-style: disc; margin-bottom: 8px; color: #D8E2F2; }
.article-content ol li { list-style: decimal; margin-bottom: 8px; color: #D8E2F2; }
.article-content strong { color: #fff; }

.article-footer-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; justify-content: center; }

/* 文章空状态 */
.article-empty {
  text-align: center; padding: 80px 24px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: 20px;
}
.article-empty i { font-size: 46px; color: var(--accent); margin-bottom: 18px; }
.article-empty h2 { font-size: 26px; margin-bottom: 12px; }
.article-empty p { color: var(--text-secondary); margin-bottom: 26px; }

/* ===== 区块头 ===== */
.section-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 30px; gap: 20px; }
.section-eyebrow { display: block; font-size: 13px; letter-spacing: 3px; color: var(--accent); text-transform: uppercase; margin-bottom: 8px; font-weight: 600; }
.section-header h2 { font-size: clamp(24px, 3vw, 30px); font-weight: 700; color: #fff; line-height: 1.3; }
.link-more { font-size: 14px; color: var(--accent); display: inline-flex; align-items: center; gap: 6px; transition: gap .2s; }
.link-more:hover { gap: 10px; }

/* ===== 相关推荐 ===== */
.related-section { padding-top: 20px; padding-bottom: 60px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card {
  display: block; background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-card); overflow: hidden;
  transition: all .25s ease; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}
.related-card:hover { transform: translateY(-5px); border-color: rgba(0, 212, 255, 0.35); box-shadow: 0 8px 30px rgba(0, 212, 255, 0.12); }
.related-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.related-card img { width: 100%; height: 180px; object-fit: cover; }
.card-body { padding: 20px; }
.card-body h3 { font-size: 18px; margin: 10px 0 8px; font-weight: 600; color: #fff; transition: color .2s; }
.related-card:hover .card-body h3 { color: var(--accent); }
.card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }

/* ===== CTA ===== */
.cta-section { padding: 20px 0 60px; }
.cta-card {
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(0, 119, 255, 0.06)), rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.22);
  border-radius: 20px; padding: clamp(28px, 5vw, 48px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}
.cta-badge { display: inline-flex; align-items: center; gap: 8px; padding: 5px 14px; border-radius: var(--radius-pill); font-size: 13px; background: rgba(74, 222, 128, 0.14); border: 1px solid rgba(74, 222, 128, 0.25); color: var(--green); margin-bottom: 16px; }
.cta-info h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 700; margin-bottom: 10px; color: #fff; }
.cta-info p { font-size: 15px; color: var(--text-secondary); max-width: 520px; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; flex-shrink: 0; }

/* ===== FAQ ===== */
.faq-section { padding: 20px 0 70px; }
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-card);
  padding: 22px 26px;
  transition: border-color .25s ease, box-shadow .25s ease;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}
.faq-item:hover { border-color: rgba(0, 212, 255, 0.3); box-shadow: 0 0 20px rgba(0, 212, 255, 0.08); }
.faq-item h3 { font-size: 17px; font-weight: 600; color: #fff; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.faq-item h3::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px rgba(0, 212, 255, 0.7); flex-shrink: 0; }
.faq-item p { font-size: 15px; color: var(--text-secondary); line-height: 1.75; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 60px 0 40px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .footer-logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: #fff; margin-bottom: 14px; }
.footer-brand .footer-logo .logo-icon { width: 32px; height: 32px; font-size: 13px; }
.footer-brand p { font-size: 14px; color: var(--text-secondary); max-width: 340px; line-height: 1.8; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 14px; color: var(--text-secondary); transition: color .2s ease; }
.footer-col ul a:hover { color: var(--accent); }
.footer-copyright { border-top: 1px solid rgba(255, 255, 255, 0.08); padding-top: 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-muted); }
.footer-copyright a { color: var(--text-muted); transition: color .2s ease; }
.footer-copyright a:hover { color: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .nav-menu { gap: 18px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .site-header .container { height: 60px; justify-content: center; }
  .logo-text { font-size: 16px; }
  .article-heading { padding: 30px 0 22px; }
  .article-title { font-size: 24px; }
  .article-meta { gap: 12px; font-size: 13px; }
  .article-body { padding: 20px 0 8px; }
  .article-content { padding: 20px 18px; border-radius: 16px; }
  .article-content p { font-size: 15px; line-height: 1.85; }
  .article-content h2 { font-size: 22px; }
  .cta-card { flex-direction: column; align-items: flex-start; padding: 28px 22px; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1; }
  .related-grid { grid-template-columns: 1fr; }
  .section-header { align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-copyright { flex-direction: column; }
  .breadcrumb .current { max-width: 220px; }
}
@media (max-width: 375px) {
  .article-title { font-size: 21px; }
  .article-meta { gap: 10px; }
  .article-footer-tags .tag { font-size: 12px; padding: 5px 10px; }
  .footer-grid { grid-template-columns: 1fr; }
}